What Is a Hologram?
A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and the resulting image. A holographic...
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What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they could see themselves in still...
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What Is a Watermark?
A watermark is an identifying image or pattern in paper which is very useful in the examination of paper as it can be used for dating, identifying sizes, mill...
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How Are the Pictures Formed on Camera Film?
How Are the Pictures Formed on Camera Film? Photographic film is a thin sheet of plastic, coated with special chemicals. Where light rays hit the film, chemical changes...
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When Were Mirrors First Used?
We will never know who first discovered the idea of a mirror. But our earliest ancestors must have noticed that they could see their reflections in the surface of a...
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